Sir (Arthur) Gareth Ludovic Emrys Rhys Williams, 3rd Baronet,[1] CB CEng FIET FIMechE CCMI (born 9 November 1961), is a British engineer, businessman and civil servant.[2][3] As of 2024[update], Sir Gareth is HMG Chief Commercial Officer in the Cabinet Office, where he has served since 2016.[2][4]